aavs receiver
DESCRIPTION
AAVS receiver. Federico Perini AAVP 2011 12-16 December, 2011 - ASTRON, Dwingeloo. AAVS0. Embedded element Mutual coupling. AAVS0 test sites. Lord’s Bridge, Cambridge. AAVS0 test sites. Medicina. AAVS0 RFI. RBW=10KHz VBW=10KHz SPAN=50-500MHz - PowerPoint PPT PresentationTRANSCRIPT
AAVS receiver
Federico PeriniAAVP 2011 12-16 December, 2011 - ASTRON, Dwingeloo
AAVS0
Embedded elementMutual coupling
AAVS0 test sites
Lord’s Bridge, Cambridge
AAVS0 test sites
Medicina
AAVS0 RFI
RBW=10KHzVBW=10KHzSPAN=50-500MHz
Data corrected for antenna gain and coax loss
Elements under test
LNA for Vivaldi
TNC connectors, 50Ohm I&OVmin=3V, I=60mA (180mW) Bias through output coax cable or feed through
LNA for Logperiodic
Diferrential input
Static discharge path
Balun Coaxial output
LNA1
LNA2
DC block
Based on AVAGO MGA-16516Low Noise, High Linearity Match Pair Low Noise Amplifier
• Frequency range 70 to 450MHz• Gain > 20dB (40dB)• Gain flatness, as flat as possible consistent with meeting other spec. parameters• Noise temperature < 30K at 450MHz• P1dB, high enough to allow astronomical observations to be made at Lords Bridge• Power consumption < 100mW (Vmin=4.5V, I=131mA)• Unconditionally stable at both input and output ports• Differential source (antenna), single-ended (50Ohm) load • High Level of Common Mode Signal Rejection• Biasing through the coax cable
AAVS0: embedded pattern
AAVS0: embedded pattern
AAVS0: mutual coupling
Shelter
VNA
AAVS0: mutual coupling
TX
Shelter
TX
RX
VNA
RX
Link for AAVS0 tests
Gain (dB) -25IRL (dB) >15ORL (dB) >20
IIP3 (dBm) +33NF (dB) 36
SFDR (dB/Hz2/3) 114
AAVS0, 1 ,#?
Embedded elementMutual couplingBeamformingBandpassTsys….
AAVS0+ ?
SKADS/prepSKA BEST RX
3C196 radiomap obtained with the Medicina BEST-2 SKADS demonstrator array and the CASPER data processing
NB
ADC65MS/s
12bitROACH
NB
NB
NB
1
2
3
16
AAVS0+ receiver: Narrow Band
• I/Q balancing• 1024ch spectrometer• Digital Beamformer• Digital Correlator
NB
NB
NB
NB
NB RX specifications
Frequency Range 70 - 450MHz
Output Bandwidth 2xIQ 0-16MHz
Minimum GainKTB@50MHz=-88.5dBmKTB@70MHz=-92dBmKTB@450MHz=-108dBm
53dB (considering the LNA) @2bit for noise@50MHz=33.5dB@70MHz=37dB@450MHz=53dB
Noise Figure <5dB
Input return loss <-15dB
Output return loss <-15dB
SFDR >60dB (10bits) TBD
Minimum output signal-49dBm @3bit for noise-55dBm @2bit for noise
Ripple ±1dBDisequalization <3dB (70-450MHz)
NB receiver: block diagram
NG TXA Filter bank0-180°
NG
BIAS T
Filter
0 90°
DIG ATTA FILT
FMSTOP
RX
A
ADC65MS/s
12bit+
ROACH
A
Control & Power Supplies
LO
Coax from LNA
Powerto LNA
COUPL
Control & Power Supplies
FilterA
BOX under/close the antenna
NB receiver components
NB receiver: LO distributor
LO level: Typ=0dBm(-6dBm to 6dBm)
LO frequency at the input to the device have to be twice that of the desired LO frequency at the mixer
core.
RF from 70 to 450MHz
LO from 140 to 900MHz
AD5387IQ mixer
WB RX
WB 1GS/s8bit
ROACHWB 1GS/s
8bit
WB 1GS/s8bit
WB 1GS/s8bit
WB: test bandpass and stability characteristics of the RF-chain.
A 1024ch spectrometer is being developed which will split the 500MHz into 500kHz channels.
WB receiver: block diagram
NG TXA Filter Bank0-180°
NG
BIAS T
DIG ATTA FILT
FMSTOP
RX
A
ADC1GS/s8bit
+ROACH
Control & Power Supplies
Coax from LNA
Powerto LNA
COUPL
Control & Power Supplies
BOX under/close the antenna
Pre-White A
Conclusions
• AAVS0: RoF links (already available) are sufficient
• AAVS0+: narrow and wide band receivers are under development– OL distributor, mechanical housing and RX
control by reusing BEST stuff– Back End & Firmware already available too
• AAVS1: evolution of the WB AAVS0+
Thanks!